March 2000 © TOSHIBA TEC
11-77
DP120F/DP125F Troubleshooting
4.7.8 Uneven Print
4.7.9 Black Dots/White Dots
Check points
Is the machine placed on a slanted sur-
face?
Does the uneven print repeat at 96mm
(3.78”) intervals?
Does the uneven print repeat at 64mm
(2.52”) intervals?
Does the uneven print repeat at 13-16mm
(0.51-0.63”) intervals?
Is there any foreign material stuck to the
feed gears?
When no problem is found in the steps
above, the Developer assembly, the Drum
unit, the LSU or the Main PBA may be de-
fective.
Solutions
Place the machine on a flat surface.
Clean the substance on the either end (sil-
ver parts) of the drum using a cotton swab.
Clean the substance on the both sides
(mold parts) of the magnet roller in the
Developer assembly.
Replace the Developer assembly.
Clean the gears or replace the Feed gear
assembly.
Replace in the order of: Developer assem-
bly, Drum unit, LSU, Main PBA.
Step
1
2
3
4
5
6
Check points
Is the bottom of the Drum unit dirty?
Are the paper transport mechanism and/
or feed rollers (Pickup roller, Paper feed
roller or Exit roller) dirty?
Is the Fuser cleaner dirty or are there any
foreign obstacles stuck to the Fuser
cleaner?
Do the black or white dots repeat at 96mm
(3.78”) intervals?
Are black or white dots repeat at 29mm
(1.14 inches) intervals?
Solutions
Clean the bottom of the Drum unit (Be care-
ful not to touch the drum surface.)
Clean the paper transport section and roll-
ers.
Replace the Fuser cleaner.
Replace the Drum unit.
Replace the Fuser.
Step
1
2
3
4
5
Summary of Contents for DP120F
Page 1: ...PLAINPAPERFACSIMILE File No 31200001 R0112216901 TTEC ...
Page 401: ...DP120F DP125F Circuit Description 7 92 March 2000 TOSHIBA TEC 07 05 00 Fig 7 5 1 ...
Page 656: ...DP120F DP125F Troubleshooting 11 44 March 2000 TOSHIBA TEC ...
Page 700: ...DP120F DP125F Appendix 12 2 March 2000 TOSHIBA TEC 1 2 Error Count List ...
Page 701: ...March 2000 TOSHIBA TEC 12 3 DP120F DP125F Appendix 1 3 Function List for Maintenance ...
Page 702: ...DP120F DP125F Appendix 12 4 March 2000 TOSHIBA TEC 1 4 Drum Unit ...
Page 703: ...March 2000 TOSHIBA TEC 12 5 DP120F DP125F Appendix 1 5 Memory Dump List ...
Page 706: ...SHUWA SHIBA PARK BLDG A 2 4 1 SHIBA KOEN MINATO KU TOKYO 105 8524 JAPAN ...